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公开(公告)号：US10481181B2
公开(公告)日：2019-11-19
申请号：US15496152
申请日：2017-04-25
Applicant: Allegro MicroSystems, LLC
Inventor： Wade Bussing , Alexander Latham , Shaun D. Milano , Christian Feucht
IPC: G01R15/20 , H01L23/495 , G01R33/00
Abstract: Systems and methods described herein are directed towards differential current sensing a current sensor having two or more magnetic field sensing elements that are oriented to sense a magnetic field generated by a current through an external conductor in the same direction. The current sensor can be positioned such that at least one first magnetic field sensing element is vertically aligned with the external conductor and at least one second magnetic field sensing element is not vertically aligned with the external conductor. The magnetic field sensing elements may be spaced from each to measure a gradient field and can generate a magnetic field signal indicative of a distance between the respective magnetic field sensing element and the current carrying external conductor. A difference between the magnetic field signals can be determined that is indicative of the current through the external conductor.
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公开(公告)号：US20190250220A1
公开(公告)日：2019-08-15
申请号：US16394338
申请日：2019-04-25
Applicant: Allegro MicroSystems, LLC
Inventor： Alexander Latham , Michael C. Doogue , Jason Boudreau
IPC: G01R33/00 , G01R33/032 , H01F5/00 , G01N27/90 , G01R33/12 , G01R33/025
CPC classification number: G01R33/0094 , G01N27/90 , G01R33/0005 , G01R33/0011 , G01R33/0017 , G01R33/0029 , G01R33/025 , G01R33/032 , G01R33/1284 , H01F5/003 , H01F2027/348
Abstract: An apparatus comprises a first substrate and two coils supported by the first substrate and arranged next to each other, the coils configured to each generate a magnetic field which produces eddy currents in and a reflected magnetic field from a conductive target, the two coils arranged so their respectively generated magnetic fields substantially cancel each other in an area between the coils. One or more magnetic field sensing elements are positioned in the area between the coils and configured to detect the reflected magnetic field.
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33.发明申请公开(公告)号：US20190219616A1
公开(公告)日：2019-07-18
申请号：US15869620
申请日：2018-01-12
Applicant: Allegro MicroSystems, LLC
Inventor： Bryan Cadugan , Rémy Lassalle-Balier , Alexander Latham , Paolo Campiglio , Noémie Belin
Abstract: A current sensor can indirectly measure a sensed current by directly measuring static perturbing AC magnetic fields with magnetoresistance elements, the perturbing magnetic fields generated by perturbing coils. The sensed current can be indirectly measured by modulating or changing sensitivities of the magnetoresistance elements in a way that is directly related to the sensed current.
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34.发明授权公开(公告)号：US10156614B2
公开(公告)日：2018-12-18
申请号：US15363208
申请日：2016-11-29
Applicant: Allegro MicroSystems, LLC
Inventor： Alexander Latham , William P. Taylor
Abstract: The concepts, systems, circuits and techniques described herein are directed toward sensing a voltage transient within a magnetic field sensor integrated circuit, such as a current sensor. A magnetic field sensor integrated circuit includes a substrate having a first surface and a second opposing surface, at least one magnetic field sensing element supported by a first surface of the substrate, an electromagnetic shield layer disposed on a shielded region of the first surface of the substrate adjacent to an unshielded region of the first surface of the substrate and an electrode disposed in the unshielded region of the first surface of the substrate and configured to permit detection of the voltage transient. In some embodiments, the shielded region and/or the electrode can be omitted.
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公开(公告)号：US20180340986A1
公开(公告)日：2018-11-29
申请号：US15606332
申请日：2017-05-26
Applicant: Allegro MicroSystems, LLC , COMMISSARIAT À L'É;NERGIE ATOMIQUE ET AUX ÉNERGIES ALTERNATIVES
Inventor： Alexander Latham , Claude Fermon , Jason Boudreau , Myriam Pannetier-Lecoeur , Bryan Cadugan , Hemán D. Romero
IPC: G01R33/00
Abstract: A magnetic field sensor includes at least one coil responsive to an AC coil drive signal; at least one magnetic field sensing element responsive to a sensing element drive signal and configured to detect a directly coupled magnetic field generated by the at least one coil and to generate a magnetic field signal in response to the directly coupled magnetic field; a processor responsive to the magnetic field signal to compute a sensitivity value associated with detection of the directly coupled magnetic field and substantially independent of a reflected magnetic field reflected by a conductive target disposed proximate to the at least one magnetic field sensing element; and an output signal generator configured to generate an output signal of the magnetic field sensor indicative of the reflected magnetic field.
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Patent Agency Ranking
公开(公告)号：US10132879B2
公开(公告)日：2018-11-20
申请号：US15161553
申请日：2016-05-23
Applicant: Allegro Microsystems, LLC
Inventor： Alexander Latham , Craig S. Petrie
Abstract: A magnetic field sensor for sensing external magnetic fields on multiple axes comprises a coil structure and a gain equalization circuit. The coil structure generates reference fields on magnetic field sensing elements in each axis. The gain equalization circuit measures and compares reference fields to generate gain-equalized output signals responsive to the external magnetic fields.
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公开(公告)号：US20180149677A1
公开(公告)日：2018-05-31
申请号：US15363285
申请日：2016-11-29
Applicant: Allegro MicroSystems, LLC
Inventor： Shaun D. Milano , Bryan Cadugan , Michael C. Doogue , Alexander Latham , William P. Taylor , Harianto Wong , Sundar Chetlur
CPC classification number: G01R15/148 , G01R15/202 , G01R15/205 , G01R15/207 , G01R19/0092 , H01L2224/16145 , H01L2224/48091 , H01L2224/48247 , H01L2224/48465 , H01L2224/73265 , H01L2924/00014 , H01L2924/00
Abstract: Systems and methods described herein are directed towards integrating a shield layer into a current sensor to shield a magnetic field sensing element and associated circuitry in the current sensor from electrical, voltage, or electrical transient noise. In an embodiment, a shield layer may be disposed along at least one surface of a die supporting a magnetic field sensing element. The shield layer may be disposed in various arrangements to shunt noise caused by a parasitic coupling between the magnetic field sensing element and the current carrying conductor away from the magnetic field sensing element.
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公开(公告)号：US09291876B2
公开(公告)日：2016-03-22
申请号：US13904356
申请日：2013-05-29
Applicant: Allegro Microsystems, LLC
Inventor： Bryan Cadugan , Alexander Latham
CPC classification number: G03B13/34 , G03B3/10 , H02P7/00 , H02P23/0004 , H02P25/028 , H02P25/034 , H02P31/00
Abstract: A system for controlling a motor may include a motor driver circuit for driving a camera motor. A memory capable of storing a plurality of parameters for controlling the camera motor may also be included. A set of parameters from the memory may be chosen to be applied to driving the motor. A motor control module may receive a signal from the control logic module, apply the chosen set of parameters to driving the camera motor, and command the motor driver circuit to drive the motor in accordance with the applied set of parameters. The parameters may be chosen based on desired behavior of the system and various other stimuli.
Abstract translation: 用于控制电动机的系统可以包括用于驱动照相机电动机的电动机驱动器电路。 还可以包括能够存储用于控制照相机电动机的多个参数的存储器。 可以选择来自存储器的一组参数来应用于驱动电动机。 电机控制模块可以从控制逻辑模块接收信号，应用所选择的一组参数来驱动摄像机电机，并且根据所应用的一组参数命令电动机驱动电路来驱动电动机。 可以基于系统的期望行为和各种其它刺激来选择参数。
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公开(公告)号：US12130342B2
公开(公告)日：2024-10-29
申请号：US17806336
申请日：2022-06-10
Applicant: Allegro MicroSystems, LLC
Inventor： Rémy Lassalle-Balier , Alexander Latham
CPC classification number: G01R33/098 , G01R15/205 , G01R33/091
Abstract: In one aspect, a magnetic field current sensor includes an annihilation detector. The annihilation detector includes an annihilation bridge that includes magnetoresistance elements. The annihilation detector also includes a current bridge that includes at least two of the magnetoresistance elements, a first comparator configured to compare an output signal from the annihilation bridge and a second comparator configured to compare an output signal from the current bridge. An output of the annihilation detector indicates whether an annihilation exists in one or more of the magnetoresistance elements using at least one of the outputs signals of the first and second comparators.
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公开(公告)号：US20240004016A1
公开(公告)日：2024-01-04
申请号：US17804647
申请日：2022-05-31
Applicant: Allegro MicroSystems, LLC
Inventor： Yannick Vuillermet , Loïc André Messier , Simon E. Rock , Maxwell McNally , Alexander Latham , Andreas P. Friedrich
CPC classification number: G01R35/005 , G01R15/202 , G01R15/207 , G01R33/072
Abstract: Auto-calibrating current sensor integrated circuits (ICs) are configured for mounting at a position relative to a conductor. The auto-calibrating current sensor ICs can include a plurality of magnetic field sensing elements disposed at different locations within the integrated circuit, respectively, and can be configured to measure a magnetic field produced by a current carried by the conductor. The auto-calibrating sensors can include an electromagnetic model of the IC and the conductor. The model can be operative to determine a magnetic field at points in space due to a given current in the conductor at a known location of the conductor from the IC, and also the inverse situation of determining an unknown current and/or location of the conductor based on measurements of a magnetic field at known locations in space due to an unknown current in the conductor. Related auto-calibration methods are also described.
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